When did tesla invented the fluorescent light?

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It was Alexandre-Edmond Becquerel who first conceived the idea of placing a fluorescent coating on the inner surface of a high voltage gas discharge tube but he didn't quite made it work properly. Tesla's investigations in the area of high-voltage RF power processing techniques did result in the very first high efficiency, high frequency lighting ballasts in 1892.

The answer is Agapito G. Flores, the unheralded Filipino inventor of the fluorescent light..
Though his invention was never fully acknowledged by the earlier Philippine Presi…dent, Manuel L. Quezon, his ideas were overheard by an Official of the French Government. The Official later invited Mr. Agapito to Paris where he was given a patent for his fluorescent light bulb..
Very soon, the General Electric company in the US bought Mr. Flores' bulb. This bulb, sold to millions of households all over the world, was known as the "Fluorescent Lamp." ~ .

Agapito Flores was a Filipino who invented the first FLUORESCENT light bulb. Edward E. Hammer invented the compact fluorescent light bulb only. He did not invent alternating c…urrent. In the Philippines it is traditional to believe that the fluorescent lamp was invented by Benigno Flores from Cepoc, Cebu City, Philippines. The idea is that the lamp was named after Flores but this is untrue, as is discussed in the First Related Link shown below this answer. The scientific discoveries and technical developments leading up to the first practical fluorescent lamp occurred over a period of decades in the 19th and early 20th centuries. As a result, it is difficult to name a single inventor but, if patents mean anything, we could suggest Peter Cooper Hewitt. Some of those who contributed (in no particular order): .
George Gabriel Stokes .
Heinrich Geissler .
William Crookes .
Daniel McFarlan Moore .
Peter Cooper Hewitt , patented (U.S. patent 889,692) the first mercury vapor lamp in 1901. .
Edmund Germer .
George Inman .
Richard Thayer. There is a useful reference on this topic in the Second Related Link shown below this answer. For more information see the Related Links and the answers to the Related Questions , which are all shown below.

The term "Fluorescent" dates back to approximately 1845-1852 where the English mathematician-physicist George Gabriel Stokes from Cambridge University named this "phenomenon" …after fluorite, a strongly fluorescent mineral. The invention of the fluorescent light is a string of discoveries and developments by many people in several countries. It was developed over 80 years since the invention of the working electric light bulb by Thomas Edison. Like so many things that we take for granted today, fluorescent lighting is the result of numerous small additions to the knowledge and technology of the time. The development started with experiments in the 1840s by British scientists, George C. Stokes, Michael Faraday and James Clerk Maxwell. A German glass blower, Heinrich Geissler, continued with the experiments and in 1856 produced a vacuum tube that would produce a green glow when a current was passed through it. The tube had little practical value because the green light didn't provide useful illumination. However, Julius Plucker and Alexandre Bequerel experimented with the tube. Bequerel discovered that certain minerals glowed when they were in an operating tube and added coatings to the inside of the tube that would glow. At the 1893 World's Fair, the World Columbian Exposition in Chicago, Illinois displayed Nikola Tesla's fluorescent lights. In 1896, Thomas Edison put a calcium coating into the tube and generated useful light. The short life of the tube meant that it never went into production. Nicola Tesla contributed with variations of the tube, again without producing a commercial product. Daniel Moore continued Edison's work and 1904 saw his tubes being used commercially for some limited applications. In 1894, D. McFarlane Moore created the Moore lamp, a commercial gas discharge lamp meant to compete with the incandescent light bulb of his former boss Thomas Edison. The gases used were nitrogen and carbon dioxide emitting respectively pink and white light, and had moderate success. An American engineer, Peter Cooper Hewitt (1861-1921) developed the mercury vapor lamp at the same time. It produced yet another green light output so its practical application was limited. Peter Cooper Hewitt patented (U.S. patent 889,692) the first mercury vapor lamp in 1901. The low pressure mercury arc lamp of Peter Cooper Hewitt is the very first prototype of today's modern fluorescent lights. In France, George Claude made neon and argon tubes which glowed red and blue respectively. Although it was not of practical use for illlumination, the neon tubes employed electrodes that were longer lasting than others of the time. Fellow Frenchman Jacques Risler added a fluorescent coating to Claude's tubes and his product made it to commercial production. In Germany, Friedrich Meyer, Hans-Joachim Spanner, and Edmund Germer all worked on low pressure vapor lamps. Although they achieved technical success, their lamp was never manufactured commerically. General Electric had interests in the new lighting technology and had purchased several patents including Germer's. It came down to George E. Inman and his team of engineers at GE to turn the technology into a commercially viable product. There were a number of legal battles that were fought during the 1920s and 1930s to establish the rights to the technologies. Because of the number of people who contributed to the product, there were numerous patents that affected it. Commercial sales of fluorescent lamps by GE commenced in 1938. It has been reported that Agapito Flores, a Philippino inventor, received a French patent for a fluorescent bulb and that the General Electric Company bought Flores' patent rights and manufactured and sold his fluorescent bulb (making millions from it). However, all the inventors named above and more predate Agapito Flores' possible work on any fluorescent bulb. According to Dr. Benito Vergara of the Philippine Science Heritage Center, "As far as I could learn, a certain Flores presented the idea of fluorescent light to Manuel Quezon when he became president. At that time, General Electric Co. had already presented the fluorescent light to the public." There are other names that do not get mentioned in this brief answer. Each person made their own important contribution and although they are not mentioned, credit should be given to each person who experimented, played, observed and developed the science and technology surrounding the development. Although the early part of the 20th century saw large companies funding and sponsoring inventors and developers, there were many who carried out work without other funding. Perhaps it is the independent experimenters who deserve special recognition for their work. See the related links below for more information about the history of the fluorescent lamp. Bondi Junction Edgecliff Kings s\

The fluorescent lamp was invented by Hans Fluor, a Swiss immigrant to the US who had worked in the Swiss patent office. In Switzerland, he had endured a lot of ribbing about h…is name meaning "flower", and he had hoped that in the US he could pursue his dream of growing avocadoes. Unfortunately, in the US he was constantly asked if his last name meant "flour", and in disgust took up the questionable trade of inventing things. For twenty years he and Edison corresponded on subjects ranging from racy movies to the harm done by Hebrews, while he invented the modern anti-macassar, the radial tire, and finally the fluorescent light. He committed suicide when he found that most people spelled his invention "flourescent".

Despite the fact that Tesla worked closely with Westinghouse, he still retained his own laboratory, and was very happy when he was working there. He continued to make new disc…overies, one of which was a lamp that fluoresced, and was actually a forerunner of today's fluorescent tubes. These hit the market some fifty years after Tesla's prototypes! He also investigated many other phenomena including X-rays and a vacuum tube or valve very similar to the Audion or triode valve pioneered by de Forest in 1907.

Despite the fact that Tesla worked closely with Westinghouse, he still retained his own laboratory, and was very happy when he was working there. He continued to make new disc…overies, one of which was a lamp that fluoresced, and was actually a forerunner of today's fluorescent tubes. These hit the market some fifty years after Tesla's prototypes! He also investigated many other phenomena including X-rays and a vacuum tube or valve very similar to the Audion or triode valve pioneered by de Forest in 1907.